Patent GB-424132-A (GB)
Title: Improvements in or relating to calculating machines, accounting machines and similar machines
IPC: B41J11/48
Filed: 1933-08-15
Abstract: 424,132. Typewriters &c. NATIONAL CASH REGISTER CO., Dayton, Ohio, U.S.A.- (Assignees of Christian, R. A. ; 246, Telford Avenue, Dayton, Ohio, U.S.A.) Aug. 15, 1933, No. 22752. Convention date, Jan. 27. [Class 100 (iv)] Sheet feeding and guiding arrangements; paper carriages and supports; column - printing arrangements; printing - line indicators.-In a calculating or like machine having a travelling carriage and a platen adapted to be rocked automatically at certain predetermined carriage-positions, the rocking-means are rendered potentially effective by the adjustment of the carriage to one of the said positions, and are operated by a subsequent machine operation with the carriage in the same position, the carriage remaining stationary or tabulating to another position, as desired. The platen 64, Figs. 1 and 3, is mounted in a tilting frame comprising end-plates 52 and cross-rods, and pivotally supported by three-armed members 59, which engage pins 61 on one of the cross-rods and the platen axle 63. The platen is removably secured in position by a spring collar 65. The members 59 pivot about an axle 67 in the travelling carriage 51. Levers 69 pivoted to the carriage 51 engage levers 74 pivoted to the platen frame on an axle 76 which also carries spring-pressed arms 77, carrying rollers 102. The rollers 102 act, through arms 104, on arms 108 which have arcuate surfaces 109 terminating in notches 110. When the levers 69 are rocked, the arm 108 moves until the surfaces 109 contact with rollers 111 on the carriage, and then the whole frame swings round the axle 57 until the notches 110 engage the roller 111 and lock the platen in swung-back position. The pressureroller assemblies comprise arms 86, Fig. 4, fast to a shaft 85 and carrying a rod 90, adapted to engage arms 92 loose on the shaft 85 and urged upwards by adjustable coil-springs. Small arms 94 carrying pairs of rollers 96 and shields 97 are pivoted to the arms 92. The rollers are brought automatically into and out of contact with the platen by levers 84, fast to the shaft 85 and carrying rollers 82 which are engaged by cam-slots 79 in extensions of the arms 77. The slots 79 are shaped so that the rollers are released after the platen has swung back and vice versa. The platen is returned to printing position by a finger-lever 126 pivoted on the carriage and engaging a slotted link 128 acting on a stud on the arm 74. The platen-frame is provided with a feed-table 56 for the record sheet, and a table 225 for the ledger sheet, both with adjustable side guides. A front feed shoot and printing-line indicator, comprising a bar 222 and adjustable guides 224, is mounted between arms 213, mounted on the platen shaft and provided with rollers 215 running in slots 217 in the carriage. As the platen is rocked back, the shoot is swung forward until it co-operates with the table 225. A spring- catch mounted over the slot 217 serves to prevent accidental rocking of the platen. Auxiliary pressure-rollers 260 on spring- pressed arms 258 are provided to hold the record sheet to the platen. The platen is automatically rocked by a printer-shaft 143, Fig. 10, which is rocked by link 145 and arm 148 first to the right and then to the left at every machine operation. A pin 141 on an arm 142 on the shaft is adapted to engage a notch 140 on a link 137 and thereby, through an arm 135, move the arms 69 to rock the platen. The link 137 is normally disabled from engaging the pin 141 by a trigger 156 which is held in place by a train of levers 159, 162, 166. In a predetermined tabular-position of the carriage, a nose 168, Fig. 12, on the lever 166 is engaged by a projection 169 on the tabulator rail, thus upsetting the trigger 156 and permitting rocking of the platen at the next machine actuation. For actuation in different carriage positions, adjustable projections 335, Fig. 1, are mounted on the tabulator rail. The machine may be released by either of two releasebars 199, 360, Fig. 19, which operate in the manner described in Specification 424,149. The bar 199 tabulates the carriage and the bar 360 line - spaces the platen, as well as releasing the machine. The rocking of the platen occurs after an impression has been made. Line-spacing mechanism.-The action of the release-bar 360, Fig. 19, is to restrain a bar 384 from forward movement so that a latch 387 carried by an arm 388 is not disabled by the interaction of a projection 385 on the bar and a pin 386 on the latch. Then, during the upward movement of an arm 394 on the printer-shaft 143, a pin 395 on the arm engages the latch 387, and, through arms 388, 390, link 391, and hook 392, depresses a paper-feed rail 393. The feed-rail is pivoted about the axle 57 and connected by a slotted link 233, Fig. 7, to pawl-and-ratchet mechanism on the platen axle. An adjustable ratchet-shield is provided for single or multiple spacing, and a pawl stop to prevent over-throw. Since, when the platen is rocked, the hook 392 will not engage the rail 393, an auxiliary line-spacing mechanism is provided, comprising an arm 253 on the carriage adapted to engage a roller 251 on the pawl arm to rotate the platen during the rocking movement. After operation a bushing 399 disengages the catch 387 and a spring 400 returns the parts to normal. Margin stops; locking-devices.-Means are provided to prevent depression of the releasebars when the platen is rocked back and when the end of a record sheet approaches the printing- line. Fingers 176 fast to a shaft 175, Figs. 4 and 16, are urged towards apertures in the feed table 56, so that when the end of the sheet has passed, the fingers and the shaft are rocked clockwise, thereby, through a train of levers 177, 181, 184, 188, and 191, permitting a latch lever 194 to be moved by a spring 219 to impede the motion of a lever 197 in the release bar mechanism. When the platen is in the rockedback position a bar 183 mounted between the levers 181 is removed from engagement with the lever 184 and the release-mechanism is similarly locked. A finger-lever 203 disables the locking-mechanism by camming the lever 181 anticlockwise by a cam surface 205. Every time the platen is rocked, an arm 209 on the axle 76 rocks the lever 203 back to inactive position so that the lever 203 must be reset to permit use of the release bars. Overdraft mechanism as described in Specification 420,807, [Group XIX], is provided. Specifications 28253 /08, [Class 100], and 337,799, [Class 100 (iv)], also are referred to.